HTTP headers

This tool will help you see that a URL returns correct headers for example when validating post URLs, 301s, or content security policies.

Click here to test it with an example! Can you spot a custom header? I added it to the site a long time ago. Hopefully it's still there.

Enter a URL

Headers send from https://hifk.fi

HTTP/1.1 200 OK
Connection: close
Content-Type: text/html; charset=UTF-8
link: ; rel="https://api.w.org/"
link: ; rel="alternate"; title="JSON"; type="application/json"
link: ; rel=shortlink
x-litespeed-cache: hit
transfer-encoding: chunked
date: Wed, 04 Feb 2026 04:11:57 GMT
server: LiteSpeed
strict-transport-security: max-age=31536000


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